1

#include "stdafx.h"

     2

#include "ttd.h"

     3

#include "gui.h"

     4

#include "command.h"

     5

#include "player.h"

     6

#include "console.h"

     7

     8

#if defined(WIN32)

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#	include <windows.h>

    10

#	include <winsock.h>

    11

    12

# pragma comment (lib, "ws2_32.lib")

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# define ENABLE_NETWORK

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# define GET_LAST_ERROR() WSAGetLastError()

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# define EWOULDBLOCK WSAEWOULDBLOCK

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#endif

    17

    18

#if defined(UNIX)

    19

// Make compatible with WIN32 names

    20

#	define SOCKET int

    21

#	define INVALID_SOCKET -1

    22

// we need different defines for MorphOS and AmigaOS

    23

#if !defined(__MORPHOS__) && !defined(__AMIGA__)

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#	define ioctlsocket ioctl

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# define closesocket close

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# define GET_LAST_ERROR() errno

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#endif

    28

// Need this for FIONREAD on solaris

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#	define BSD_COMP

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#	include <unistd.h>

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#	include <sys/ioctl.h>

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    33

// Socket stuff

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#	include <sys/socket.h>

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#	include <netinet/in.h>

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#	include <arpa/inet.h>

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# 	include <errno.h>

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# 	include <sys/time.h>

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// NetDB

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#   include <netdb.h>

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    42

# ifndef TCP_NODELAY

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#  define TCP_NODELAY 0x0001

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# endif

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    46

#endif

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    48

    49

#if defined(__MORPHOS__) || defined(__AMIGA__)

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#	include <exec/types.h>

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#	include <proto/exec.h> 		// required for Open/CloseLibrary()

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#	if defined(__MORPHOS__)

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#		include <sys/filio.h> 	// FION#? defines

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#	else // __AMIGA__

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#		include	<proto/socket.h>

    56

#	endif

    57

    58

// make source compatible with bsdsocket.library functions

    59

# define closesocket(s)     						CloseSocket(s)

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# define GET_LAST_ERROR() 							Errno()

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#	define ioctlsocket(s,request,status)  IoctlSocket((LONG)s,(ULONG)request,(char*)status)

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    63

struct Library *SocketBase = NULL;

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    66

// usleep() implementation

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#include <devices/timer.h>

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#include <dos/dos.h>

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    70

struct Device       *TimerBase    = NULL;

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struct MsgPort      *TimerPort    = NULL;

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struct timerequest  *TimerRequest = NULL;

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#endif /* __MORPHOS__ || __AMIGA__ */

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    77

    78

#define SEND_MTU 1460

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    80

#if defined(ENABLE_NETWORK)

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    82

// sent from client -> server whenever the client wants to exec a command.

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// send from server -> client when another player execs a command.

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typedef struct CommandPacket {

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	byte packet_length;

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	byte packet_type;

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	uint16 cmd;

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	uint32 p1,p2;

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	TileIndex tile;

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	byte player;// player id, this is checked by the server.

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	byte when;  // offset from the current max_frame value minus 1. this is set by the server.

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	uint32 dp[8];

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} CommandPacket;

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    95

assert_compile(sizeof(CommandPacket) == 16 + 32);

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    97

#define COMMAND_PACKET_BASE_SIZE (sizeof(CommandPacket) - 8 * sizeof(uint32))

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    99

// sent from server -> client periodically to tell the client about the current tick in the server

   100

// and how far the client may progress.

   101

typedef struct SyncPacket {

   102

	byte packet_length;

   103

	byte packet_type;

   104

	byte frames; // how many more frames may the client execute? this is relative to the old value of max.

   105

	byte server; // where is the server currently executing? this is negatively relative to the old value of max.

   106

	uint32 random_seed_1; // current random state at server. used to detect out of sync.

   107

	uint32 random_seed_2;

   108

} SyncPacket;

   109

   110

assert_compile(sizeof(SyncPacket) == 12);

   111

   112

// sent from server -> client as an acknowledgement that the server received the command.

   113

// the command will be executed at the current value of "max".

   114

typedef struct AckPacket {

   115

	byte packet_length;

   116

	byte packet_type;

   117

} AckPacket;

   118

   119

typedef struct FilePacketHdr {

   120

	byte packet_length;

   121

	byte packet_type;

   122

	byte unused[2];

   123

} FilePacketHdr;

   124

   125

assert_compile(sizeof(FilePacketHdr) == 4);

   126

   127

// sent from server to client when the client has joined.

   128

typedef struct WelcomePacket {

   129

	byte packet_length;

   130

	byte packet_type;

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	byte unused[2];

   132

} WelcomePacket;

   133

   134

typedef struct Packet Packet;

   135

struct Packet {

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	Packet *next; // this one has to be the first element.

   137

	uint siz;

   138

	byte buf[SEND_MTU]; // packet payload

   139

};

   140

   141

typedef struct ClientState {

   142

	int socket;

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	bool inactive; // disable sending of commands/syncs to client

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	bool writable;

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	uint xmitpos;

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   147

	uint eaten;

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	Packet *head, **last;

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   150

	uint buflen;											// receive buffer len

   151

	byte buf[256];										// receive buffer

   152

} ClientState;

   153

   154

   155

static uint _not_packet;

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   157

typedef struct QueuedCommand QueuedCommand;

   158

struct QueuedCommand {

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	QueuedCommand *next;

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	CommandPacket cp;

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	CommandCallback *callback;

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	uint32 cmd;

   163

	int32 frame;

   164

};

   165

   166

typedef struct CommandQueue CommandQueue;

   167

struct CommandQueue {

   168

	QueuedCommand *head, **last;

   169

};

   170

   171

#define MAX_CLIENTS (MAX_PLAYERS + 1)

   172

   173

// packets waiting to be executed, for each of the players.

   174

// this list is sorted in frame order, so the item on the front will be executed first.

   175

static CommandQueue _command_queue;

   176

   177

// in the client, this is the list of commands that have not yet been acked.

   178

// when it is acked, it will be moved to the appropriate position at the end of the player queue.

   179

static CommandQueue _ack_queue;

   180

   181

static ClientState _clients[MAX_CLIENTS];

   182

static int _num_clients;

   183

   184

// keep a history of the 16 most recent seeds to be able to capture out of sync errors.

   185

static uint32 _my_seed_list[16][2];

   186

   187

typedef struct FutureSeeds {

   188

	int32 frame;

   189

	uint32 seed[2];

   190

} FutureSeeds;

   191

   192

// remember some future seeds that the server sent to us.

   193

static FutureSeeds _future_seed[8];

   194

static int _num_future_seed;

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   196

static SOCKET _listensocket; // tcp socket

   197

   198

static SOCKET _udp_client_socket; // udp server socket

   199

static SOCKET _udp_server_socket; // udp client socket

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   201

typedef struct UDPPacket {

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	byte command_code;

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	byte data_len;

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	byte command_check;

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	byte data[255];

   206

} UDPPacket;

   207

   208

enum {

   209

	NET_UDPCMD_SERVERSEARCH = 1,

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	NET_UDPCMD_SERVERACTIVE,

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	NET_UDPCMD_GETSERVERINFO,

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	NET_UDPCMD_SERVERINFO,

   213

};

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   215

void NetworkUDPSend(bool client, struct sockaddr_in recv,struct UDPPacket packet);

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   217

uint32 _network_ip_list[10]; // network ip list

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   219

// this is set to point to the savegame

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static byte *_transmit_file;

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static size_t _transmit_file_size;

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   223

static FILE *_recv_file;

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   225

typedef struct NetworkGameInfo {	

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	char server_name[40];			// name of the game

   227

	char server_revision[8];	// server game version

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	byte server_lang;					// langid

   229

	byte players_max;					// max players allowed on server

   230

	byte players_on;					// current count of players on server

   231

	uint16 game_date;					// current date

   232

	char game_password[10];		// should fit ... 10 chars

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	char map_name[40];				// map which is played ["random" for a randomized map]

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	uint map_width;						// map width / 8

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	uint map_height;					// map height / 8

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	byte map_set;							// graphical set

   237

} NetworkGameInfo;

   238

   239

typedef struct NetworkGameList {

   240

	NetworkGameInfo item;

   241

	uint32 ip;

   242

	uint16 port;

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	char * _next;

   244

} NetworkGameList;

   245

   246

static NetworkGameInfo _network_game;

   247

static NetworkGameList * _network_game_list = NULL;

   248

   249

/* multi os compatible sleep function */

   250

void CSleep(int milliseconds) {

   251

#if defined(WIN32)

   252

Sleep(milliseconds);

   253

#endif

   254

#if defined(UNIX)

   255

#if !defined(__BEOS__) && !defined(__MORPHOS__) && !defined(__AMIGAOS__) 

   256

usleep(milliseconds*1000);

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#endif

   258

#ifdef __BEOS__

   259

snooze(milliseconds*1000);

   260

#endif

   266

	ULONG signals;

   267

	ULONG TimerSigBit = 1 << TimerPort->mp_SigBit;

   268

   269

	// send IORequest

   270

	TimerRequest->tr_node.io_Command = TR_ADDREQUEST;

   271

	TimerRequest->tr_time.tv_secs    = (milliseconds * 1000) / 1000000;

   272

	TimerRequest->tr_time.tv_micro   = (milliseconds * 1000) % 1000000;

   273

	SendIO((struct IORequest *)TimerRequest);

   274

   275

	if ( !((signals = Wait(TimerSigBit|SIGBREAKF_CTRL_C)) & TimerSigBit) ) {

   276

		AbortIO((struct IORequest *)TimerRequest);

   277

	}

   278

	WaitIO((struct IORequest *)TimerRequest);

   279

}

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#endif

   282

}

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   284

//////////////////////////////////////////////////////////////////////

   285

   286

// ****************************** //

   287

// * Network Error Handlers     * //

   288

// ****************************** //

   289

   290

static void NetworkHandleSaveGameError() {

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		_networking_sync = false;

   292

		_networking_queuing = true;

   293

		_switch_mode = SM_MENU;

   294

		_switch_mode_errorstr = STR_NETWORK_ERR_SAVEGAMEERROR;

   295

}

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   297

static void NetworkHandleConnectionLost() {

   298

		_networking_sync = false;

   299

		_networking_queuing = true;

   300

		_switch_mode = SM_MENU;

   301

		_switch_mode_errorstr = STR_NETWORK_ERR_LOSTCONNECTION;

   302

}

   303

static void NetworkHandleDeSync() {

   304

	printf("fatal error: network sync error at frame %i\n",_frame_counter);

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		{

   306

			int i;

   307

			for (i=15; i>=0; i--) printf("frame %i: [0]=%i, [1]=%i\n",_frame_counter-(i+1),_my_seed_list[i][0],_my_seed_list[i][1]);

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			for (i=0; i<8; i++) printf("frame %i: [0]=%i, [1]=%i\n",_frame_counter+i,_future_seed[i].seed[0],_future_seed[i].seed[1]);

   309

		}

   310

		_networking_sync = false;

   311

		_networking_queuing = true;

   312

		_switch_mode = SM_MENU;

   313

		_switch_mode_errorstr = STR_NETWORK_ERR_DESYNC;

   314

}

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   316

// ****************************** //

   317

// * TCP Packets and Handlers   * //

   318

// ****************************** //

   319

   320

static QueuedCommand *AllocQueuedCommand(CommandQueue *nq)

   321

{

   322

	QueuedCommand *qp = (QueuedCommand*)calloc(sizeof(QueuedCommand), 1);

   323

	assert(qp);

   324

	*nq->last = qp;

   325

	nq->last = &qp->next;

   326

	return qp;

   327

}

   328

   329

// go through the player queues for each player and see if there are any pending commands

   330

// that should be executed this frame. if there are, execute them.

   331

void NetworkProcessCommands()

   332

{

   333

	CommandQueue *nq;

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	QueuedCommand *qp;

   335

   336

	// queue mode ?

   337

	if (_networking_queuing)

   338

		return;

   339

   340

	nq = &_command_queue;

   341

	while ( (qp=nq->head) && (!_networking_sync || qp->frame <= _frame_counter)) {

   342

		// unlink it.

   343

		if (!(nq->head = qp->next)) nq->last = &nq->head;

   344

   345

		if (qp->frame < _frame_counter && _networking_sync) {

   346

			error("!qp->cp.frame < _frame_counter, %d < %d\n", qp->frame, _frame_counter);

   347

		}

   348

   349

		// run the command

   350

		_current_player = qp->cp.player;

   351

		memcpy(_decode_parameters, qp->cp.dp, (qp->cp.packet_length - COMMAND_PACKET_BASE_SIZE));

   352

		DoCommandP(qp->cp.tile, qp->cp.p1, qp->cp.p2, qp->callback, qp->cmd | CMD_DONT_NETWORK);

   353

		free(qp);

   354

	}

   355

   356

	if (!_networking_server) {

   357

		// remember the random seed so we can check if we're out of sync.

   358

		_my_seed_list[_frame_counter & 15][0] = _sync_seed_1;

   359

		_my_seed_list[_frame_counter & 15][1] = _sync_seed_2;

   360

   361

		while (_num_future_seed) {

   362

			assert(_future_seed[0].frame >= _frame_counter);

   363

			if (_future_seed[0].frame != _frame_counter) break;

   364

			if (_future_seed[0].seed[0] != _sync_seed_1 ||_future_seed[0].seed[1] != _sync_seed_2) NetworkHandleDeSync();

   365

			memcpy_overlapping(_future_seed, _future_seed + 1, --_num_future_seed * sizeof(FutureSeeds));

   366

		}

   367

	}

   368

}

   369

   370

// send a packet to a client

   371

static void SendBytes(ClientState *cs, void *bytes, uint len)

   372

{

   373

	byte *b = (byte*)bytes;

   374

	uint n;

   375

	Packet *p;

   376

   377

	assert(len != 0);

   378

   379

	// see if there's space in the last packet?

   380

	if (!cs->head || (p = (Packet*)cs->last, p->siz == sizeof(p->buf)))

   381

		p = NULL;

   382

   383

	do {

   384

		if (!p) {

   385

			// need to allocate a new packet buffer.

   386

			p = (Packet*)malloc(sizeof(Packet));

   387

   388

			// insert at the end of the linked list.

   389

			*cs->last = p;

   390

			cs->last = &p->next;

   391

			p->next = NULL;

   392

			p->siz = 0;

   393

		}

   394

   395

		// copy bytes to packet.

   396

		n = minu(sizeof(p->buf) - p->siz, len);

   397

		memcpy(p->buf + p->siz, b, n);

   398

		p->siz += n;

   399

		b += n;

   400

		p = NULL;

   401

	} while (len -= n);

   402

}

   403

   404

// client:

   405

//   add it to the client's ack queue, and send the command to the server

   406

// server:

   407

//   add it to the server's player queue, and send it to all clients.

   408

void NetworkSendCommand(TileIndex tile, uint32 p1, uint32 p2, uint32 cmd, CommandCallback *callback)

   409

{

   410

	int nump;

   411

	QueuedCommand *qp;

   412

	ClientState *cs;

   413

   414

	qp = AllocQueuedCommand(_networking_server ? &_command_queue : &_ack_queue);

   415

	qp->cp.packet_type = 0;

   416

	qp->cp.tile = tile;

   417

	qp->cp.p1 = p1;

   418

	qp->cp.p2 = p2;

   419

	qp->cp.cmd = (uint16)cmd;

   420

	qp->cp.player = _local_player;

   421

	qp->cp.when = 0;

   422

	qp->cmd = cmd;

   423

	qp->callback = callback;

   424

   425

	// so the server knows when to execute it.

   426

	qp->frame = _frame_counter_max;

   427

   428

	// calculate the amount of extra bytes.

   429

	nump = 8;

   430

	while ( nump != 0 && ((uint32*)_decode_parameters)[nump-1] == 0) nump--;

   431

	qp->cp.packet_length = COMMAND_PACKET_BASE_SIZE + nump * sizeof(uint32);

   432

	if (nump != 0) memcpy(qp->cp.dp, _decode_parameters, nump * sizeof(uint32));

   433

   434

#if defined(TTD_BIG_ENDIAN)

   435

	// need to convert the command to little endian before sending it.

   436

	{

   437

		CommandPacket cp;

   438

		cp = qp->cp;

   439

		cp.cmd = TO_LE16(cp.cmd);

   440

		cp.tile = TO_LE16(cp.tile);

   441

		cp.p1 = TO_LE32(cp.p1);

   442

		cp.p2 = TO_LE32(cp.p2);

   443

		for(cs=_clients; cs->socket != INVALID_SOCKET; cs++) if (!cs->inactive) SendBytes(cs, &cp, cp.packet_length);

   444

	}

   445

#else

   446

	// send it to the peers

   447

	for(cs=_clients; cs->socket != INVALID_SOCKET; cs++) if (!cs->inactive) SendBytes(cs, &qp->cp, qp->cp.packet_length);

   448

   449

#endif

   450

}

   451

   452

// client:

   453

//   server sends a command from another player that we should execute.

   454

//   put it in the command queue.

   455

//

   456

// server:

   457

//   client sends a command that it wants to execute.

   458

//   fill the when field so the client knows when to execute it.

   459

//   put it in the appropriate player queue.

   460

//   send it to all other clients.

   461

//   send an ack packet to the actual client.

   462

   463

static void HandleCommandPacket(ClientState *cs, CommandPacket *np)

   464

{

   465

	QueuedCommand *qp;

   466

	ClientState *c;

   467

	AckPacket ap;

   468

   469

	printf("net: cmd size %d\n", np->packet_length);

   470

   471

	assert(np->packet_length >= COMMAND_PACKET_BASE_SIZE);

   472

   473

	// put it into the command queue

   474

	qp = AllocQueuedCommand(&_command_queue);

   475

	qp->cp = *np;

   476

   477

	qp->frame = _frame_counter_max;

   478

   479

	qp->callback = NULL;

   480

   481

	// extra params

   482

	memcpy(&qp->cp.dp, np->dp, np->packet_length - COMMAND_PACKET_BASE_SIZE);

   483

   484

	ap.packet_type = 2;

   485

	ap.packet_length = 2;

   486

   487

	// send it to the peers

   488

	if (_networking_server) {

   489

		for(c=_clients; c->socket != INVALID_SOCKET; c++) {

   490

			if (c == cs) {

   491

				SendBytes(c, &ap, 2);

   492

			} else {

   493

				if (!cs->inactive) SendBytes(c, &qp->cp, qp->cp.packet_length);

   494

			}

   495

		}

   496

	}

   497

   498

// convert from little endian to big endian?

   499

#if defined(TTD_BIG_ENDIAN)

   500

	qp->cp.cmd = TO_LE16(qp->cp.cmd);

   501

	qp->cp.tile = TO_LE16(qp->cp.tile);

   502

	qp->cp.p1 = TO_LE32(qp->cp.p1);

   503

	qp->cp.p2 = TO_LE32(qp->cp.p2);

   504

#endif

   505

   506

	qp->cmd = qp->cp.cmd;

   507

}

   508

   509

// sent from server -> client periodically to tell the client about the current tick in the server

   510

// and how far the client may progress.

   511

static void HandleSyncPacket(SyncPacket *sp)

   512

{

   513

	uint32 s1,s2;

   514

   515

	_frame_counter_srv = _frame_counter_max - sp->server;

   516

	_frame_counter_max += sp->frames;

   517

   518

	printf("net: sync max=%d  cur=%d  server=%d\n", _frame_counter_max, _frame_counter, _frame_counter_srv);

   519

   520